320 MOLLUSCA. 



T. einerarius, Turt. 

 Still more widely diffused, and in greater numbers than the last- 

 Found at the depth of a few fathoms, as well as living between tide- 

 marks. 



T. littoralis, Brown. 



Killough, County Down, and Clew Bay, County Mayo, are the localities 

 in which this species is said to be found. 



T. tumidus, Turt. 

 Dredged in very limited numbers from the deeper portions, 10 to 12 

 fathoms, &c., in Belfast and Strangford Loughs, and at Donaghadee. Like 

 most of our jNIollusca, &c., it attains a much larger size on the Dublin 

 coast than in the localities just named. In Clifden and Clew Bays, on 

 the western coasts, it was di'edged by our party in 1840. 



T. jmpiUosus, Br. 



Dublin Bay ; Bray, County AVicklow. Single specimens of this fine 

 species have been obtained on the South-West coast of Scotland, from 50 

 fathoms off the Mull of Galloway (Capt. Beechy, R. N.), and from 40 off 

 Sana Island (Mr. Hyndman). 



T. ziziphintis, Br. 



Of common occurrence, but not numerous, on our northern coast, from 

 just below low-water mark to 12 fathoms, &c. ; inhabits chiefly the La- 

 minarian region, and is found on the fronds of Laminaria. This Troehiis 

 is subject to considerable variety: the T. discrepans, Brown, Irish Tes- 

 tacea, p. 519, pi. 24, f. 4, is noticed as such by Turton in his Conch. Diet., 

 p. 189. A single specimen only is recorded to have been found at Holy- 

 wood, Belfast Bay, by Miss Templeton. The pure white variety has been 

 dredged of all sizes, but very sparingly, in this lough, by Mr. Hyndman 

 and myself ; on one occasion we found numbers of this variety on the 

 beach at Ardmillan, wlience they were brought adherent to "wrack" 

 (fuci) cut for manure about some of the islands. 



T. millegrantis, Philippi. 



This species has been in my collection for some years from the north- 

 ern and southern localities of Strangford Lough and Bantry Bay. Prof. 

 Forbes informs me that it is to this Trnchus the name of 2'. Martini is 

 applied in Mr. Smith's paper, lately published in the Wernerian Memoirs 

 (vol. viii. part 1). It is there stated that Mr. Alder found the species at 

 Dublin, but I understand that the Irish specimens thus alluded to were 

 not from that locality, but from the one first mentioned here. Mr. Hum- 

 phreys of Cork, from whom I had the Bantry Bay specimen in 1835, 

 stated that Dr. Turton had named it T. conuloides. T. Clelandi, 

 Wood, Index, Test. Supp., f. 15, is considered another var. It was sent 

 to the Author from Strangford Lough, by James Hose Clealand, Esq., 

 Dalkey Sound, Dublin Bay, Dr. Ball ; Glandore, Coimty Cork, Prof. All- 

 man; and Killery Bay, County Mayo, and Galway, W. T. &c., may be 

 named as localities in which this Trochiis has been di'edged. In the last 

 it was taken within 3 to 12 fathoms. It inhabits the deeper portions of 

 Strangford and Belfast Loughs, chiefly from 10 to 23 fathoms, in sand 

 ooze, &c. ; living specimens were dredged from 50 fathoms off the Mull of 

 Galloway, see Ann. N. H. vol. x. 21. Bundoran, Mrs. Hancock. 



